Declan Ryan gets to his feet. It is a little after 9pm under the electric candlelight of a steakhouse and grill in Dublin’s comfortable Donnybrook.  It is the end of an insightful day at the Invest in Aviation conference in Dublin, which featured speakers including Michael O’Leary, the chief executive of Ryanair, Willie Walsh, the director general of IATA and Kenny Jacobs, the CEO of the DAA.  Ryan, a serial airline founder and investor from Ryanair to Viva, is giving Maury Gallagher, the American co-founder of Allegiant, an Unsung Hero award for his services to aviation. “This man is a legend,” Ryan said.  “People…